<template>
  <view>
    <!-- 使用自定义的搜索组件 -->
    <my-search @click= "gotoSearch"></my-search>
    <view class="scroll-view-container">
      
      <!-- 左侧的滑动区域 -->
      <scroll-view class="letf-scroll-view" scroll-y="true" :style="{height: wh + 'px'}">
        <block v-for="(item , i) in cateList" :key="i">
          <view :class="['left-scroll-view-item', i === active ? 'active' : '']" @click="activeChanged(i)">{{item.cat_name}}</view>
          </block>
        
      </scroll-view>
      
      <!-- 右侧的滑动区域 -->
      <scroll-view class="right-scroll-view" scroll-y="true" :style="{height: wh + 'px'}" :scroll-top="scrollTop">
        <view class="cate-Lv2" v-for="(item2,i2) in cateLevel2" :key="i2">
          <!-- 二级分类的标题 -->
          <view class="cate-lv2-title">/{{item2.cat_name}}/</view>
          <!-- 当前二级分类下的三级分类列表 -->
          <view class="cate-lv3-list">
            <!-- 三级分类的 item 项 -->
            <view class="cate-lv3-item" v-for="(item3 , i3) in item2.children" :key="i3" @click="gotoGoodsList(item3)">
              <!-- 三级分类的图片 -->
              <!-- <image :src="item3.cat_icon" ></image> 原 url 不可用 -->
              <image :src="item3.cat_icon.replace('dev','web')" mode="widthFix"/>
              <!-- 三级分类的文本 -->
              <text>{{item3.cat_name}}</text>
            </view>
          </view>
        </view>
      </scroll-view>
      
    </view>
  </view>
</template>

<script>
 import badgeMix from '@/mixins/tabbar-badge.js'
  
  export default {
    mixins:[badgeMix],
    data() {
      return {
        //当前设备可用的高度
        wh: 0,
        cateList: [],
        active: 0,
        //二级分类的列表
        cateLevel2:[],
        scrollTop: 0
      };
    },
    onLoad(){
     const sysInfo = uni.getSystemInfoSync()
     // console.log(sysInfo)
     this.wh = sysInfo.windowHeight -50
     
     this.getCateList()
    },
    methods:{
      //获取分类列表的数据
     async getCateList(){
      const {data:res} = await uni.$http.get('/api/public/v1/categories')
      if(res.meta.status !== 200) return uni.$showMsg()
      this.cateList = res.message
      
      //为二级分类赋值
      this.cateLevel2 = res.message[0].children
      },
      activeChanged(i){
        this.active = i
        
        //重新为二级分类赋值
        this.cateLevel2 = this.cateList[i].children
        
        this.scrollTop = this.scrollTop === 0 ? 1 :0
      },
      //跳转到商品列表页面
      gotoGoodsList(item){
        uni.navigateTo({
          url:'/subpkg/goods_list/goods_list?cid=' + item.cat_id
        })
      },
      gotoSearch(){
        // console.log('ok')
        uni.navigateTo({
           url:'/subpkg/search/search'
        })
      }
    }
  }
</script>

<style lang="scss">
.scroll-view-container{
  display: flex;
  
  .letf-scroll-view{
    width: 120px;
  }
  
  .left-scroll-view-item{
    background-color: #F7F7F7;
    line-height:60px;
    text-align: center;
    font-size: 12px;
    
    &.active{
      background-color: #FFFFFF;
      position: relative;
      
      &::before{
        content: ' ';
        display: block;
        width: 3px;
        height: 30px;
        background-color: #C00000;
        position: absolute;
        top:50%;
        left:  0;
        transform: translateY(-50%);
      }
    }
  }
}
.cate-lv2-title{
  font-size: 12px;
  font-weight: bold;
  text-align: center;
  padding: 15px 0;
  
}
.cate-lv3-list{
  display: flex;
  flex-wrap: wrap;
  
  .cate-lv3-item{
    width: 33.33%;
    display: flex; 
    flex-direction: column;
    justify-content: center;
    align-items: center;
    margin-bottom: 10px;
    
    image{
      width: 60px;
      height:60px
    }
    text{
      font-size: 12px;
    }
  }
}
</style>
